text: //===----------------------------------------------------------------------===//
  //
  //                     The LLVM Compiler Infrastructure
  //
  // This file is dual licensed under the MIT and the University of Illinois Open
  // Source Licenses. See LICENSE.TXT for details.
  //
  //===----------------------------------------------------------------------===//
  // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
  
  // <chrono>
  // class year_month_day_last;
  
  // constexpr bool operator==(const year_month_day_last& x, const year_month_day_last& y) noexcept;
  //   Returns: x.year() == y.year() && x.month_day_last() == y.month_day_last().
  //
  // constexpr bool operator< (const year_month_day_last& x, const year_month_day_last& y) noexcept;
  //   Returns:
  //      If x.year() < y.year(), returns true.
  //      Otherwise, if x.year() > y.year(), returns false.
  //      Otherwise, returns x.month_day_last() < y.month_day_last()
  
  #include <chrono>
  #include <type_traits>
  #include <cassert>
  
  #include "test_macros.h"
  #include "test_comparisons.h"
  
  int main()
  {
      using year                = std::chrono::year;
      using month               = std::chrono::month;
      using month_day_last      = std::chrono::month_day_last;
      using year_month_day_last = std::chrono::year_month_day_last;
  
      AssertComparisons6AreNoexcept<year_month_day_last>();
      AssertComparisons6ReturnBool<year_month_day_last>();
  
      constexpr month January = std::chrono::January;
      constexpr month February = std::chrono::February;
  
      static_assert( testComparisons6(
          year_month_day_last{year{1234}, month_day_last{January}},
          year_month_day_last{year{1234}, month_day_last{January}},
          true, false), "");
  
  //  different month
      static_assert( testComparisons6(
          year_month_day_last{year{1234}, month_day_last{January}},
          year_month_day_last{year{1234}, month_day_last{February}},
          false, true), "");
  
  //  different year
      static_assert( testComparisons6(
          year_month_day_last{year{1234}, month_day_last{January}},
          year_month_day_last{year{1235}, month_day_last{January}},
          false, true), "");
  
  //  different month
      static_assert( testComparisons6(
          year_month_day_last{year{1234}, month_day_last{January}},
          year_month_day_last{year{1234}, month_day_last{February}},
          false, true), "");
  
  //  different year and month
      static_assert( testComparisons6(
          year_month_day_last{year{1234}, month_day_last{February}},
          year_month_day_last{year{1235}, month_day_last{January}},
          false, true), "");
  
  //  same year, different months
      for (unsigned i = 1; i < 12; ++i)
          for (unsigned j = 1; j < 12; ++j)
              assert((testComparisons6(
                  year_month_day_last{year{1234}, month_day_last{month{i}}},
                  year_month_day_last{year{1234}, month_day_last{month{j}}},
                  i == j, i < j )));
  
  //  same month, different years
      for (int i = 1000; i < 20; ++i)
          for (int j = 1000; j < 20; ++j)
          assert((testComparisons6(
              year_month_day_last{year{i}, month_day_last{January}},
              year_month_day_last{year{j}, month_day_last{January}},
              i == j, i < j )));
  }
  